/Engine/Source/Runtime/SlateCore/Public/Input/Reply.h
An event should returnFReply::Handled().BeginDragDrop( Content ) to initiate a drag and drop operation.
reference back to theFReplyso that this call can be chained.
[FReply](API\Runtime\SlateCore\Input\FReply) & BeginDragDrop ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FDragDropOperation](API\Runtime\SlateCore\Input\FDragDropOperation) > InDragDropContent )